Step 13
Remove the three hex screws using a T8 Torx screwdriver.
The shorter screw is in the center of the computer.
Step 14
Remove the two Phillips screws on either side of the battery contacts.
Step 15
Breathe deeply. Trying times are ahead, but we promise the lower case does come off.
Push the thin rims of the lower case surrounding the battery compartment in, bending them past the tabs, and then lift up to free that corner of the lower case.